You might also want to check if people were not using different names in there ‘RT’: some might have called it ‘just a test’ or ‘go there’ — your page was rather explicit.

The next step, I think, would be to develop some loose ideas about what types of people participated in what way, but you’d have to gather more data on each Tweeter, probably from their Twitter profile: location, occupation?, # followers, # followed. I’m looking to be able to say things like “##% of re-tweeters work in the (blank) industry”. “People living in (locations) re-tweeted within (average time).” “Everyone who tweeted had a combined total of (number) followers, but there were (number) known retweets of the message.”

In any case, I think there would be real value to you putting all the results together at the end as an article or a nice PDF, since there’s really a dearth of research on Twitter (well, judging by the references on Wikipedia).